Vodacom - service unacceptable.

I closed my Vodacom account in February last year. I asked them how much I needed to pay as my account still had a few months to run. Vodacom gave m a figure just over R5000 which I paid. Vodacom has since been taking money out of my account and sending me monthly invoiced and despite much contact wih Vodacom I am unable to get the matter resolved. In the past week I have phoned Zouwa and Godfrey, but no joy. Godfrey transferred me through the cancellations department and I hung after waiting for my call to be answered.